Browsing by Author "Faria, Paulina"
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- Comparison of mineralogical, mechanical and hygroscopic characteristic of earthen, gypsum and cement-based plastersPublication . Santos, Tânia; Gomes, Maria Idália; Santos Silva, A.; Ferraz, E.; Faria, PaulinaIt is important to ensure indoor comfort by passive methods, avoiding mechanical equipment that has energy costs. To assess plasters common efficiency but also its contribution as moisture buffers, five different plastering mortars, including unstabilized and stabilized earth-based plasters, gypsum and cement-based pre-mixed plasters, were analyzed and their chemical, mechanical and hygroscopic characteristics compared. The materials and mortars were analyzed by X-ray diffraction and simultaneous thermal analysis. Linear shrinkage, dry bulk density, dynamic modulus of elasticity, flexural and compressive strengths, dry abrasion resistance, surface cohesion, surface hardness and sorption and desorption of mortars and plasters were also evaluated. The mechanical strength of earthen mortars is lower than gypsum and cement-based mortars. However, earth plasters show the highest hygroscopicity, acting as moisture passive buffers, improving thermal comfort and contributing to occupants health.
- Construção com base em terra: contributo para a ecoeficiência na construçãoPublication . Gomes, Maria; Santos, Tânia; Pereira, Cristiana; Faria, PaulinaA terra é dos mais antigos materiais de construção, existindo registos da sua utilização desde o período pré-histórico. Utilizada na construção de um vasto património edificado, como fortificações, residências nobres, igrejas, mosteiros, habitação e apoios agrícolas, entre outros, a utilização da terra apresenta inúmeras vantagens, nomeadamente, económicas, ecológicas e de conforto interior, devido à capacidade de regulação da humidade relativa do ambiente interior, conferida pela argila, que é higroscópica e incombustível. Portugal apresenta um vasto património edificado de construção com terra, tendo como principais técnicas construtivas a taipa, o adobe e o tabique, que se apresenta disperso por todo o território nacional. Lamentavelmente, grande parte deste património apresenta um estado de conservação muito debilitado e urgem intervenções de reabilitação. A construção com terra era realizada através do conhecimento empírico, transmitido de geração em geração, que foi sendo perdido devido ao desinteresse e surgimento de novos materiais, como o tijolo cerâmico cozido, argamassas e betões utilizando cimento Portland, e de novas técnicas construtivas, originando o declínio deste tipo de construção no século XX. No entanto, e com base nas vantagens do material e das técnicas construtivas ancestrais de construção com terra, registou-se um renovado interesse por este tipo de material de construção, principalmente no Sul de Portugal, não só no âmbito da conservação do património e da reabilitação das construções existentes, mas também para construção contemporânea. Ainda assim, e mesmo com o aparecimento dos blocos de terra comprimida, a construção com terra assume um papel residual no setor da construção em Portugal. No presente artigo descrevem-se, resumidamente, os principais sistemas construtivos com base em terra utilizados em Portugal, discutem-se as suas potencialidades e a relevância atual destas técnicas construtivas como contributo para a sustentabilidade ambiental, e identificam-se, ainda, algumas questões fundamentais, atualmente em aberto, como a necessidade de normalização e regulamentação.
- Earth-based mortars for repair and protection of rammed earth walls. Stabilization with mineral binders and fibersPublication . Gomes, Maria; Faria, Paulina; Diaz Gonçalves, TeresaThe use of earth as a building material offers many advantages in terms of sustainability: it is a natural material, most probably non-toxic and ecological, with low energy intensity, low carbon emissions and recyclable. Earth-based mortars are re-gaining its place as building materials for plastering, rendering and repair of earthen walls, not only in the sustainable context but also in terms of efficiency. However, the scientific knowledge about these mortars is still scarce. In particular, the opinions regarding the effects of adding fibers or mineral binders as stabilizers, to improve the performance of the mortar, are contradictory. The study presented in this article is intended to advance the knowledge about the effects of adding low amounts of hemp fibers, hydrated air lime, hydraulic lime, natural cement and Portland cement on the mechanical (flexural and compressive strength, dynamic modulus of elasticity), physical (shrinkage, thermal conductivity, porosity) and hydric (water absorption under low pressure, capillary water absorption, drying) characteristics of mortars formulated with different earth materials. Results show that the addition of the fibers decreases the thermal conductivity of the mortars, which is remarkably good for the mortars made from clayey soil, and slowers the drying of the mortars. They also show that adding the mineral binders will negatively affect the hydric behaviour of the mortars: the water absorption coefficient increases and the drying become slower as the percentage of binder increases. In addition, the use of these binders has no significant effect on the flexural and compressive strength of the mortar.
- Hydric behavior of earth materials and the effects of their stabilization with cement or lime: Study on repair mortars for historical rammed earth structuresPublication . Gomes, Maria; Diaz Gonçalves, Teresa; Faria, PaulinaEarthen building materials bear interesting environmental advantages and are the most appropriate to conserve historical earth constructions. To improve mechanical properties, these materials are often stabilized with cement or lime, but the impact of the stabilizers on the water transport properties, which are also critical, has been very rarely evaluated. The researchers have tested four earth-based repair mortars applied on three distinct and representative rammed earth surfaces. Three mortars are based on earth collected from rammed earth buildings in south of Portugal and the fourth mortar is based on a commercial clayish earth. The main objective of the work was over the commercial earth mortar, applied stabilized and not stabilized on the three rammed earth surfaces to repair, to assess the influence of the stabilizers. The other three earth mortars (not stabilized) were applied on each type of rammed earth, representing the repair only made with local materials. The four unstabilized earth materials depicted nonlinear dependence on t1/2 during capillary suction. This behavior was probably caused by clay swelling. Stabilization with any of the four tested binders enabled the linear dependence of t1/2 expected from Washburn's equation, probably because the swelling did not take place in this case. However, the stabilizers also significantly increased the capillary suction and the capillary porosity of the materials. This means that, in addition to increasing the carbon footprint, stabilizers, like cement and lime, have functional disadvantages that discourage their use in repair mortars for raw earth construction.
- Rammed earth walls repair by earth-based mortars: The adequacy to assess effectivenessPublication . Gomes, Maria; Faria, Paulina; Diaz Gonçalves, TeresaRepairs in rammed earth walls are often necessary mainly because of degradation occurring during the life time of a building with continuous environmental exposure. The defects that arise in the walls are generally associated with loss of its thickness, on the surface or in greater depth. They must be repaired with a mortar technically efficient and compatible with the rammed earth, to ensure protection and, as possible, long-term durability. The present study describes and discusses the adequacy of earth-based mortars to repair unstabilized rammed earth walls and the behaviour of the systems rammed walls-earth repair mortars when subjected to accelerated aging tests by wetting-drying cycles. Even under aggressive capillarity tests, the results observed corroborate that unstabilized earth repair mortars behave better in comparison to similar mortars with additions of low amounts of different inorganic binders.
- Regulação da qualidade do ar interior através da utilização de argamassas ecoeficientesPublication . Gomes, Maria Idália; Faria, Paulina; Gomes, JoãoEm meados do século XX identificou-se o Síndrome do Edifício Doente associado a uma série de queixas e desconforto ambiental sentido por parte dos ocupantes dos edifícios. Embora as técnicas construtivas nos edifícios tenham evoluído, melhorando o conforto genérico dos seus ocupantes, teve sentido contrário o nível de qualidade do ar interior devido às características da construção, materiais utilizados, tipo de ocupação e sistemas de aquecimento, arrefecimento utilizados, com redução da ventilação. A qualidade do ar interior tem sido referida como um dos principais riscos ambientais para a saúde pública. Está comprovado que, em muitas circunstâncias, o nível de poluição no interior dos edifícios pode atingir valores 2 a 5 vezes superiores ao do ar exterior. Compreender a natureza dos poluentes do ar interior e desenvolver materiais com a capacidade de captar estes mesmos poluentes, reduzindo a sua concentração no ar, ao mesmo tempo que contribuem para regular as condições de temperatura e humidade relativa, é de extrema importância. Assim, com o objetivo de melhorar o desenvolvimento de estratégias na construção, reduzir a exposição humana a agentes poluentes agressivos com risco para a saúde e monitorizar a melhoria das condições interiores de conforto em Portugal, propõe-se com este artigo divulgar o início dos trabalhos do projeto INDEED sobre o efeito de argamassas de reboco interior ecoeficientes. Está comprovado que as argamassas com base em terra argilosa aplicadas em rebocos têm um efeito bastante mais ativo no equilíbrio termohigrométrico que outros revestimentos. No âmbito do projeto vão desenvolver-se argamassas com base também em terra argilosa cujo contributo para a captação de poluentes presentes no ar interior – nomeadamente partículas de aerossóis (PM10 e PM2,5), dióxido de carbono (CO2), monóxido de carbono (CO), ozono (O3) e compostos orgânicos voláteis (COVs), tais como formaldeído e os BTEX - seja superior ao de argamassas de reboco correntes utilizadas na construção.
- Unstabilized rammed Earth: characterization of material collected from old constructions in South Portugal and comparison to normative requirementsPublication . Gomes, Idália da Silva; Gonçalves, Teresa Diaz; Faria, PaulinaUnstabilized rammed earth is a recyclable, economical, and eco-friendly building material, used in the past and still applied today. Traditionally, its use was based on a long empirical knowledge of the local materials. Because this knowledge was mostly lost or is no longer sufficient, in many countries normative documents have been produced to allow the assessment of rammed earth soils. With the aim of contributing for a refining of these normative requirements, this article presents a research work that included: (i) collection of Unstabilized rammed earth samples from six constructions in Portugal; (ii) a literature survey of normative and complementary documents to identify the most mentioned key-properties, the test procedures and the corresponding threshold limits; and (iii) a discussion of the test procedures and of the thresholds limits in the light of the experimental results. The analyzed properties are the particle size distribution, maximum particle size, plasticity, compaction, linear shrinkage, organic content, and salt content. The work highlights the advantages of taking into account the characteristics of existing constructions as a basis for the establishment and further refining of consistent threshold values. In particular, it shows that it is essential to adjust the requirements to the specificities of local materials.